Cruise Control System
CRUISE CONTROL: CRUISE CONTROL SYSTEM: SYSTEM DIAGRAM
Communication Table
SYSTEM DESCRIPTION
1. CRUISE CONTROL SYSTEM
The cruise control system maintains constant vehicle speed. It enables the driver to adjust the vehicle speed by operating the cruise control main switch without using the accelerator pedal.
The power management control ECU receivers signals from each switch and sensor, and maintains constant vehicle speed by optimizing the use of the engine and motor driving force.
* The power management control ECU receives signals such as ON-OFF, - SET, + RES, and CANCEL from the cruise control main switch and executes the command.
* The power management control ECU illuminates the combination meter's cruise main indicator light when it receives a cruise control main switch ON signal.
Text in Illustration
* The power management control ECU displays "SET" on the multi-information display when constant speed control is started by pushing the cruise control main switch to "- SET".
* The power management control ECU cancels cruise control operation when the brake pedal is depressed and the power management control ECU receives a stop light switch signal.
* The power management control ECU cancels cruise control operation when the shift lever is moved from D to N or 3rd, 2nd, or 1st range is selected with the shift lever in S, and the power management control ECU receives a shift position sensor signal.
2. LIMIT CONTROL
(a) Low speed limit
The lowest possible limit of the speed setting range is set at approximately 40 km/h (25 mph). The cruise control system cannot be set when the vehicle speed is below the low speed limit. Cruise control operation will be automatically canceled but the stored vehicle speed will be retained when the vehicle speed drops below the low speed limit of 40 km/h (25 mph) while the cruise control is in operation.
(b) High speed limit
The highest possible limit of the speed setting range is set at approximately 200 km/h (125 mph). The cruise control system cannot be set when the driving vehicle speed is over the high speed limit. Also, + RES cannot be used to increase speed over the high speed limit.
3. CRUISE CONTROL OPERATION
The cruise control main switch operates 7 functions: SET, - (COAST), TAP-DOWN, RES (RESUME), + (ACCEL), TAP-UP, and CANCEL. The SET, TAP-DOWN, and - (COAST) functions, and the RES (RESUME), TAP-UP, and + (ACCEL) functions are operated with the same switch. The cruise control main switch is an automatic return type switch which turns on only while operating it in the direction of each arrow and turns off after releasing it.
(a) SET CONTROL
Vehicle speed is stored and constant speed control is maintained when pushing the cruise control main switch to - SET while driving with the main switch on (the cruise main indicator light and "SET" indicator come on), and the vehicle speed is within the set speed range (between the low and high speed limits).
(b) - (COAST) CONTROL
The power management control ECU decreases the cruise control demand speed and controls the engine and motor driving force to decelerate the vehicle when - SET on the cruise control main switch is pressed and held while the cruise control system is in operation. When the cruise control main switch is released from - SET, vehicle speed is stored and constant speed control is maintained.
(c) TAP-DOWN CONTROL
When tapping down the cruise control main switch to - SET (for approximately 0.6 seconds) while the cruise control system is in operation, the stored vehicle speed decreases each time by approximately 1.6 km/h (1 mph). When the cruise control main switch is released from - SET and the difference between the driving and stored vehicle speeds is more than 5 km/h (3 mph), the driving vehicle speed is stored and constant speed control is maintained.
(d) + (ACCEL) CONTROL
The power management control ECU increases the cruise control demand speed and controls the engine and motor driving force to accelerate the vehicle when + RES on the cruise control main switch is pressed and held while the cruise control system is in operation.
When the cruise control main switch is released from + RES, vehicle speed is stored and constant speed control is maintained.
(e) TAP-UP CONTROL
When tapping up the cruise control main switch to + RES (for approximately 0.6 seconds) while the cruise control system is in operation, the stored vehicle speed increases each time by approximately 1.6 km/h (1 mph). However, when the difference between the driving and the stored vehicle speeds is more than 5 km/h (3 mph), the stored vehicle speed will not be changed.
(f) RES (RESUME) CONTROL
If cruise control operation was canceled with the stop light switch assembly or the CANCEL switch, and if driving speed is within the limit range, pushing the cruise control main switch to + RES restores vehicle speed memorized at the time of cancellation, and maintains constant speed control.
(g) MANUAL CANCEL CONTROL
Performing any of the following cancels the cruise control system while it is operating (the stored vehicle speed in the ECM is maintained).
* Depressing the brake pedal
* Moving the shift lever from D to N or selecting the 3rd, 2nd, or 1st range with the shift lever in S
* Pushing the cruise control main switch to CANCEL
* Turning the cruise control main switch off (the stored vehicle speed in the ECM is not maintained)
4. AUTO CANCEL (FAIL-SAFE)
This system has an automatic cancellation function (fail-safe) Fail-Safe Chart.